2003 H2 Intermittently Starts

[Suzie]

Thank you for your replies/help.

I asked my trusted local mechanic about checking the main ground from the battery to the engine block for a loose connection. He instantly said that is not the problem. If that were the problem, the car would not start at all.

Cerritos Hummer is sticking to their story that it is a faulty key ignition switch that is causing the problem. I finally told them to go ahead and replace it at their quoted price of $220. I do not believe this is causing the intermittent start problem. So I figure it will be another couple hundred tossed out the window on this same problem (already in for $700 and not fixed yet).

Update: Just got off the phone with an update. After recieving the okay to put in the not-needed new key ignition switch (I will eat dirt if I'm wrong), the service rep who IS Steve Devry, called to say when he started it to move it to GM down the street (not sure why I'm paying for Hummer and getting GM but he claims it doesn't matter)....the check engine light came on and the "REDUCED ENGINE POWER."

Sure am glad that perhaps they will now believe me, as they did not before. So I will write an update as this unfolds real time.

I also think Steve Devry is a nice enough person. I just wish he would return calls in a timely manner and LISTEN to the customer.

Why can't I take my car to a Hummer dealership and ask them to do the work I want done? I just want them to READ the GM Service Bulletin that states that intermittent starts can be corrected by reprogramming the PCM and TAC modules. I want them to at least consider this could be the problem.

As far as codes prior to today's start of the car, the codes that came up so far were 1518 (which my trusted mechanic already told me about) and 1875.

Devry said the 1518 is for the throttle body, that it is not getting 12 volts.
1875 is saying that the encoder motor is not working, according to Devry.

Does anyone out there know a really good mechanic at a Hummer dealership in southern California? I know someone mentioned a Mike S. at Tustin Hummer, but I am not familiar with any Hummer dealership in Tustin.

Thanks again for the help. I hope this thread hopes other Hummer owners that end up with the same problem.